Tk::autobind offers a convenient way to set up a form and have ALT-key bindings for the widgets on that form.
All you have to do is call autobind after you create a widget.
If the widget has an -underline configuration option set to a value greater than or equal to 0,
its ALT-key binding is the key at that location in the widget's -text configuration option.

For example,
if you have a Checkbutton with the following -text:

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and its -underline value is set to 0, then if the user presses ALT-A while the focus is in the widget's main window, the checkbutton widget will be invoked.